Heat exchange structure for hot blast stove

Abstract

The utility model relates to the technical field of hot blast stoves, in particular to a heat exchange structure for a hot blast stove, which is simpler in structure and high in reliability, heat flow flows outside the heat exchange structure, and heat flow channels are prevented from being blocked. Comprising a furnace body, a combustor and a smoke pipe, a heating cavity is formed in the furnace body, the combustor is installed at the bottom of the heating cavity of the furnace body, the smoke pipe is installed on the side wall of the furnace body, and the smoke pipe is communicated with the heating cavity of the furnace body; the air inlet pipe is installed on the side wall of the furnace body, the input end of the air inlet pipe is located outside the furnace body, the lower header pipe is installed at the output end of the air inlet pipe, the lower ends of the multiple heat exchange pipes are installed on the lower header pipe, the upper header pipe is installed at the upper ends of the multiple heat exchange pipes, and the air outlet pipe is installed on the lower header pipe. The input end of the air outlet pipe is connected with the upper header pipe, the output end of the air outlet pipe extends out of the top of the furnace body, and the air inlet pipe, the lower header pipe, the heat exchange pipes, the upper header pipe and the air outlet pipe are sequentially communicated.

Description

Technical Field

[0001] This utility model relates to the technical field of hot blast stoves, and in particular to heat exchange structures for hot blast stoves. Background Technology

[0002] A hot blast stove is a type of thermodynamic machinery, which can be divided into two types based on its working principle: regenerative and heat exchange types. The heat exchange type hot blast stove uses a high-temperature resistant air exchange structure as its core component. Existing technologies disclose various heat exchange structures, such as the heat exchanger structure for a biomass hot blast stove proposed in Chinese invention patent CN113418302B. This heat exchanger structure has three return-pass components within its shell, allowing the heat flow to move through three strokes within the shell. This not only increases the contact area with the cold airflow blown by the fan but also extends the flow path of the heat flow, enhancing the heat exchanger's heat exchange effect. The airflow entering the third stroke component is heated by a heating element, which enhances the subsequent heating of the cold airflow. Furthermore, the fire ring can heat and burn the tiny biomass particles floating in the hot flow, improving the utilization of biomass.

[0003] However, the heat exchange structure is relatively complex. The heat flow is in the channels inside the shell. Since the heat flow contains impurities such as smoke, it is easy to cause blockage of the heat flow channels inside the shell, resulting in low reliability. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a heat exchange structure for hot blast stoves with a simpler structure, in which heat flow flows outside the heat exchange structure, avoiding blockage of the heat flow channel and ensuring high reliability.

[0005] This utility model relates to a heat exchange structure for a hot air furnace, comprising a furnace body, a burner, and a flue. The furnace body has an internal heating chamber, with the burner installed at the bottom of the chamber. The flue is installed on the side wall of the furnace body and communicates with the heating chamber. The structure also includes an inlet pipe, a lower main pipe, multiple heat exchange tubes, an upper main pipe, and an outlet pipe. The inlet pipe is installed on the side wall of the furnace body, with its input end located outside the furnace body. The lower main pipe is installed at the output end of the inlet pipe. The lower ends of the multiple heat exchange tubes are installed on the lower main pipe, and the upper main pipe is installed at the upper ends of the multiple heat exchange tubes. The input end of the outlet pipe is connected to the upper main pipe, and its output end extends beyond the top of the furnace body. The inlet pipe and the lower main pipe... Multiple heat exchange tubes, an upper main pipe, and an exhaust pipe are connected in sequence. During operation, the burner heats the air at the bottom of the furnace's heating chamber, and the resulting flue gas and hot air are discharged through the flue pipe. At the same time, low-temperature air is input into the lower main pipe through the air inlet pipe. The lower main pipe distributes the cold air to multiple heat exchange tubes and transports it to the upper main pipe. The heat in the hot air and flue gas heats the low-temperature air flowing within them into high-temperature air through multiple heat exchange tubes. The high-temperature air is collected in the upper main pipe and discharged from the furnace through the exhaust pipe. Compared with existing technologies, the structure is simpler, and the heat flow only flows outside the heat exchange structure. There are no tortuous heat flow channels, avoiding channel blockage caused by smoke, dust, and other impurities, resulting in high reliability.

[0006] Preferably, it also includes multiple outer fins and multiple inner fins, with multiple outer fins evenly installed on the outer wall of multiple heat exchange tubes and multiple inner fins evenly installed on the inner wall of multiple heat exchange tubes; by installing multiple outer fins and multiple inner fins on the outer and inner walls of multiple heat exchange tubes, the heat exchange area is increased and the heat exchange efficiency is improved.

[0007] Preferably, the assembly also includes a connecting ring, an external gear ring, a shaft, a gear, and a turbine. The lower main pipe is rotatably mounted on the output end of the air inlet pipe, and the upper main pipe is rotatably mounted in the heating chamber of the furnace body. The connecting ring is connected to multiple heat exchange tubes, and an external gear ring is installed on the outer wall of the connecting ring. The shaft is rotatably mounted in the flue pipe, and a gear is concentrically mounted on the inner end of the shaft, meshing with the external gear ring. A turbine is installed on the outer end of the shaft, and the turbine is located in the flue pipe. When the hot air and flue gas generated by the burner are discharged through the flue pipe, they drive the turbine to rotate the shaft. The shaft, through gear meshing with the external gear ring, drives the connecting ring to rotate. The connecting ring drives multiple heat exchange tubes to rotate, ensuring that the multiple heat exchange tubes are in uniform contact with the hot air and flue gas in the heating chamber of the furnace body, reducing the problem of uneven heat exchange among the multiple heat exchange tubes and improving heating efficiency.

[0008] Preferably, it also includes a sleeve, which is installed on the top of the furnace body. The lower part of the sleeve is concentrically fitted outside the output end of the air outlet pipe. A gap is provided between the sleeve and the air outlet pipe. The output end of the sleeve extends into the top of the furnace body. The high-temperature air output from the air outlet pipe rushes into the sleeve and is transported to the outside of the furnace body through the sleeve. At the same time, the hot air generated by the burner gathers at the top of the heating chamber of the furnace body and is drawn into the sleeve through the gap between the sleeve and the air outlet pipe. It is transported outward along with the high-temperature air, thereby increasing the output flow rate of the high-temperature air.

[0009] Preferably, it also includes a filter layer, which is installed in the heating chamber of the furnace body. The middle part of the air outlet pipe passes through the filter layer, and the filter layer is located below the lower end of the sleeve. The filter layer filters the hot air that gathers at the top of the heating chamber of the furnace body, reducing the amount of smoke and dust entering the sleeve and improving the cleanliness of the high-temperature air output.

[0010] Preferably, it also includes a blocking plate and a push rod. A blocking plate is installed around the outer wall of the middle part of the air outlet pipe. The blocking plate is located below the lower end of the sleeve. The diameter of the blocking plate is larger than the diameter of the lower end of the sleeve. The middle part of the sleeve is movably connected to the top of the furnace body. One end of the push rod is connected to the sleeve, and the other end of the push rod is connected to the furnace body. The piston rod of the push rod extends and retracts to drive the sleeve to rise and fall. When the sleeve falls, the lower end of the sleeve engages with the blocking plate, so that the blocking plate seals the gap between the sleeve and the air outlet pipe. At this time, the hot air generated by the burner will not be discharged with the high-temperature air. When the sleeve rises, the lower end of the sleeve disengages from the blocking plate, so that the gap between the sleeve and the air outlet pipe opens. At this time, the hot air generated by the burner is discharged with the high-temperature air, realizing the regulation of the high-temperature air flow rate, which has good practicality.

[0011] Preferably, it also includes a temperature sensor and a smoke sensor, which are installed on the furnace body. The probes of both the temperature sensor and the smoke sensor extend into the top of the heating chamber of the furnace body and are located above the filter layer. The temperature sensor is used to detect the temperature of the hot air above the filter layer, and the smoke sensor is used to detect the cleanliness of the hot air above the filter layer. When the temperature and cleanliness of the hot air meet the requirements, the push rod drives the sleeve to rise, so that the hot air is discharged through the sleeve, thereby improving the degree of automation.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: During operation, the air at the bottom of the heating chamber of the furnace body is heated by the burner, and the generated flue gas and hot air are discharged through the flue pipe. At the same time, low-temperature air is input into the lower main pipe through the air inlet pipe. The lower main pipe distributes the cold air to multiple heat exchange tubes and transports it to the upper main pipe. The heat in the hot air and flue gas heats the low-temperature air flowing in them into high-temperature air through multiple heat exchange tubes. The high-temperature air is collected in the upper main pipe and discharged from the furnace body through the air outlet pipe. Compared with the prior art, the structure is simpler, the heat flow only flows outside the heat exchange structure, and there is no tortuous heat flow channel. This avoids channel blockage caused by smoke, dust and other impurities, and the reliability is high. Attached Figure Description

[0013] Figure 1 This is a partial cross-sectional structural schematic diagram of the present invention;

[0014] Figure 2 This is a front sectional view of the present invention;

[0015] Figure 3 This is a schematic diagram of the isometric structure of this utility model;

[0016] Figure 4 It is a structural diagram of the air inlet pipe, lower main pipe, heat exchange pipe, upper main pipe, connecting ring, external gear ring, shaft and gear, etc.

[0017] Figure 5 It is a structural diagram of the air outlet duct, sleeve, blocking plate and push rod, etc.

[0018] Figure 6 It is a front cross-sectional structural diagram of the air outlet duct, sleeve, plug, filter layer and push rod.

[0019] The following are labels in the attached diagram: 1. Furnace body; 2. Burner; 3. Smoke pipe; 4. Air inlet pipe; 5. Lower main pipe; 6. Heat exchanger pipe; 7. Upper main pipe; 8. Air outlet pipe; 9. Outer fins; 10. Inner fins; 11. Connecting ring; 12. Outer gear ring; 13. Shaft; 14. Gear; 15. Turbine; 16. Sleeve; 17. Filter layer; 18. Blocking plate; 19. Push rod; 20. Temperature sensor; 21. Smoke sensor. Detailed Implementation

[0020] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. This utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of this utility model more thorough and complete.

[0021] Example 1

[0022] like Figures 1 to 4As shown, the heat exchange structure of the hot blast stove includes a furnace body 1, a burner 2, and a flue pipe 3. A heating chamber is located inside the furnace body 1. The burner 2 is installed at the bottom of the heating chamber of the furnace body 1. The flue pipe 3 is installed on the side wall of the furnace body 1 and communicates with the heating chamber of the furnace body 1. It also includes an air inlet pipe 4, a lower main pipe 5, multiple heat exchange pipes 6, an upper main pipe 7, and an air outlet pipe 8. The air inlet pipe 4 is installed on the side wall of the furnace body 1, with its input end located outside the furnace body 1. The lower main pipe 5 is installed at the output end of the air inlet pipe 4. At the outlet, the lower ends of multiple heat exchange tubes 6 are installed on the lower main pipe 5, the upper main pipe 7 is installed on the upper end of multiple heat exchange tubes 6, the inlet end of the air outlet pipe 8 is connected to the upper main pipe 7, and the outlet end of the air outlet pipe 8 extends out of the top of the furnace body 1. The air inlet pipe 4, the lower main pipe 5, multiple heat exchange tubes 6, the upper main pipe 7 and the air outlet pipe 8 are connected in sequence. It also includes multiple outer fins 9 and multiple inner fins 10. Multiple outer fins 9 are evenly installed on the outer wall of multiple heat exchange tubes 6, and multiple inner fins 10 are evenly installed on the inner wall of multiple heat exchange tubes 6.

[0023] During operation, the burner 2 heats the air at the bottom of the heating chamber of the furnace body 1. The resulting flue gas and hot air are discharged through the flue pipe 3. At the same time, low-temperature air is input into the lower main pipe 5 through the air inlet pipe 4. The lower main pipe 5 distributes the cold air to multiple heat exchange tubes 6 and transports it to the upper main pipe 7. The heat in the hot air and flue gas heats the low-temperature air flowing in the multiple heat exchange tubes 6 into high-temperature air. The high-temperature air is collected in the upper main pipe 7 and discharged from the furnace body 1 through the air outlet pipe 8. Compared with the existing technology, the structure is simpler. The heat flow only flows outside the heat exchange structure. There are no tortuous heat flow channels, which avoids channel blockage caused by smoke and dust and other impurities. By installing multiple outer fins 9 and multiple inner fins 10 on the outer and inner walls of multiple heat exchange tubes 6, the heat exchange area is increased and the heat exchange efficiency is improved.

[0024] Example 2

[0025] like Figure 1 , Figure 2 and Figure 4 As shown, based on Embodiment 1, it also includes a connecting ring 11, an external gear ring 12, a shaft 13, a gear 14, and a turbine 15. The lower main pipe 5 is rotatably installed on the output end of the air inlet pipe 4, and the upper main pipe 7 is rotatably installed in the heating chamber of the furnace body 1. The connecting ring 11 is connected to multiple heat exchange pipes 6. The external gear ring 12 is installed on the outer wall of the connecting ring 11. The shaft 13 is rotatably installed in the flue pipe 3. The gear 14 is concentrically installed on the inner end of the shaft 13. The gear 14 meshes with the external gear ring 12. The turbine 15 is installed on the outer end of the shaft 13 and is located in the flue pipe 3.

[0026] When the hot air and flue gas generated by the burner 2 are discharged through the flue pipe 3, the turbine 15 drives the shaft 13 to rotate. The shaft 13 drives the connecting ring 11 to rotate through the gear 14 meshing with the external gear ring 12. The connecting ring 11 drives multiple heat exchange tubes 6 to rotate, so that the multiple heat exchange tubes 6 are in uniform contact with the hot air and flue gas in the heating chamber of the furnace body 1, reducing the problem of uneven heat exchange of multiple heat exchange tubes 6 and improving heating efficiency.

[0027] Example 3

[0028] like Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, based on Embodiment 1, it also includes a sleeve 16, which is installed on the top of the furnace body 1. The lower part of the sleeve 16 is concentrically fitted outside the output end of the air outlet pipe 8, and a gap is provided between the sleeve 16 and the air outlet pipe 8. The output end of the sleeve 16 extends into the upper part of the furnace body 1. It also includes a filter layer 17, which is installed in the heating chamber of the furnace body 1. The middle part of the air outlet pipe 8 passes through the filter layer 17, and the filter layer 17 is located below the lower end of the sleeve 16. It also includes a blocking plate 18 and a push rod 19. The blocking plate 18 is arranged around the outer wall of the middle part of the air outlet pipe 8. Located below the lower end of the sleeve 16, the diameter of the blocking plate 18 is larger than the diameter of the lower end of the sleeve 16. The middle part of the sleeve 16 is movably connected to the top of the furnace body 1. One end of the push rod 19 is connected to the sleeve 16, and the other end of the push rod 19 is connected to the furnace body 1. It also includes a temperature sensor 20 and a smoke sensor 21, which are installed on the furnace body 1. The probes of the temperature sensor 20 and the smoke sensor 21 extend into the top of the heating chamber of the furnace body 1. The temperature sensor 20 and the smoke sensor 21 are both located above the filter layer 17.

[0029] High-temperature air from the exhaust duct 8 rushes into the sleeve 16 and is transported to the outside of the furnace body 1 through the sleeve 16. At the same time, the hot air generated by the burner 2 is filtered by 17 and gathers at the top of the heating chamber of the furnace body 1. The push rod 19 drives the sleeve 16 to descend, and the lower end of the sleeve 16 connects with the blocking plate 18, so that the blocking plate 18 seals the gap between the sleeve 16 and the exhaust duct 8. At this time, the hot air generated by the burner 2 will not be discharged with the high-temperature air. The temperature sensor 20 is used to detect the temperature of the hot air above the filter layer 17, and the smoke sensor 21 is used to detect the cleanliness of the hot air above the filter layer 17. When the temperature and cleanliness of the hot air meet the requirements, the push rod 19 drives the sleeve 16 to rise, and the lower end of the sleeve 16 disengages from the blocking plate 18, so that the gap between the sleeve 16 and the exhaust duct 8 opens. The hot air gathered at the top of the heating chamber of the furnace body 1 is drawn into the sleeve 16 through the gap between the sleeve 16 and the exhaust duct 8 and is transported out with the high-temperature air, increasing the output flow rate of the high-temperature air.

[0030] like Figures 1 to 6 As shown, the heat exchange structure of the hot air furnace of this utility model, during operation, firstly, the burner 2 heats the air at the bottom of the heating chamber of the furnace body 1. A portion of the generated flue gas and hot air is discharged through the flue pipe 3. When the flue gas and hot air are discharged through the flue pipe 3, they drive the turbine 15 to rotate the shaft 13. The shaft 13, through gear 14 meshing with the external gear ring 12, drives the connecting ring 11 to rotate. The connecting ring 11 drives multiple heat exchange tubes 6 to rotate. Then, another portion is filtered by the filter layer 17 and gathers at the top of the heating chamber of the furnace body 1. Then, low-temperature air is input into the lower main pipe 5 through the air inlet pipe 4. The lower main pipe 5 distributes the cold air to multiple heat exchange tubes 6 and upwards to the main pipe 7. In the middle conveying process, the heat in the hot air and flue gas is heated into high-temperature air through multiple heat exchange tubes 6. The high-temperature air is collected in the upper main pipe 7 and transported through the air outlet pipe 8. Finally, when the temperature sensor 20 and the smoke sensor 21 detect that the temperature and cleanliness of the hot air meet the requirements, the push rod 19 drives the sleeve 16 to rise. The lower end of the sleeve 16 is separated from the blocking plate 18, which opens the gap between the sleeve 16 and the air outlet pipe 8. The hot air gathered at the top of the heating chamber of the furnace body 1 is drawn into the sleeve 16 through the gap between the sleeve 16 and the air outlet pipe 8 and is transported outward along with the high-temperature air, thereby increasing the output flow rate of the high-temperature air.

[0031] The main functions achieved by this utility model are:

[0032] 1. The structure is simpler, and the heat flow is outside the heat exchange structure. There are no tortuous heat flow channels, which avoids channel blockage caused by smoke, dust and other impurities, and ensures high reliability.

[0033] 2. The use of rotatable heat exchange tubes 6 ensures uniform heat exchange and improves heating efficiency;

[0034] 3. It can output the hot air generated by burner 2, increasing the output flow rate of high-temperature air.

[0035] The heat exchange structure for the hot air furnace of this utility model uses common mechanical methods for installation, connection, or setting. Any method that can achieve its beneficial effect can be implemented. The furnace body 1, burner 2, flue pipe 3, air inlet pipe 4, heat exchange pipe 6, outer fins 9, inner fins 10, outer gear ring 12, shaft 13, gear 14, turbine 15, filter layer 17, push rod 19, temperature sensor 20, and smoke sensor 21 of the heat exchange structure for the hot air furnace of this utility model are commercially available. Technical personnel in this industry only need to install and operate it according to the accompanying instruction manual, without requiring any creative work from those skilled in the art.

[0036] All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0037] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A heat exchange structure for a hot air furnace, comprising a furnace body (1), a burner (2), and a flue (3), wherein a heating chamber is provided inside the furnace body (1), the burner (2) is installed at the bottom of the heating chamber of the furnace body (1), and the flue (3) is installed on the side wall of the furnace body (1), and the flue (3) communicates with the heating chamber of the furnace body (1); characterized in that, It also includes an air inlet pipe (4), a lower main pipe (5), multiple heat exchange tubes (6), an upper main pipe (7), and an air outlet pipe (8). The air inlet pipe (4) is installed on the side wall of the furnace body (1). The input end of the air inlet pipe (4) is located outside the furnace body (1). The lower main pipe (5) is installed on the output end of the air inlet pipe (4). The lower ends of multiple heat exchange tubes (6) are installed on the lower main pipe (5). The upper main pipe (7) is installed on the upper end of multiple heat exchange tubes (6). The input end of the air outlet pipe (8) is connected to the upper main pipe (7). The output end of the air outlet pipe (8) extends out of the top of the furnace body (1). The air inlet pipe (4), the lower main pipe (5), the multiple heat exchange tubes (6), the upper main pipe (7), and the air outlet pipe (8) are connected in sequence.

2. The heat exchange structure for a hot blast stove as described in claim 1, characterized in that, It also includes multiple outer fins (9) and multiple inner fins (10). Multiple outer fins (9) are evenly installed on the outer wall of multiple heat exchange tubes (6), and multiple inner fins (10) are evenly installed on the inner wall of multiple heat exchange tubes (6).

3. The heat exchange structure for a hot blast stove as described in claim 1, characterized in that, It also includes a connecting ring (11), an external gear ring (12), a shaft (13), a gear (14), and a turbine (15). The lower main pipe (5) is rotatably installed on the output end of the air inlet pipe (4), and the upper main pipe (7) is rotatably installed in the heating chamber of the furnace body (1). The connecting ring (11) is connected to multiple heat exchange tubes (6). The external gear ring (12) is installed on the outer wall of the connecting ring (11). The shaft (13) is rotatably installed in the flue pipe (3). The gear (14) is concentrically installed on the inner end of the shaft (13). The gear (14) meshes with the external gear ring (12). The turbine (15) is installed on the outer end of the shaft (13). The turbine (15) is located in the flue pipe (3).

4. The heat exchange structure for a hot blast stove as described in claim 1, characterized in that, It also includes a sleeve (16), which is installed on the top of the furnace body (1). The lower part of the sleeve (16) is concentrically fitted on the outside of the output end of the air outlet pipe (8). A gap is provided between the sleeve (16) and the air outlet pipe (8). The output end of the sleeve (16) extends into the top of the furnace body (1).

5. The heat exchange structure for a hot blast stove as described in claim 4, characterized in that, It also includes a filter layer (17), which is installed in the heating chamber of the furnace body (1). The middle part of the air outlet pipe (8) passes through the filter layer (17), and the filter layer (17) is located below the lower end of the sleeve (16).

6. The heat exchange structure for a hot blast stove as described in claim 5, characterized in that, It also includes a blocking plate (18) and a push rod (19). The middle outer wall of the air outlet pipe (8) is surrounded by a blocking plate (18). The blocking plate (18) is located below the lower end of the sleeve (16). The diameter of the blocking plate (18) is larger than the diameter of the lower end of the sleeve (16). The middle part of the sleeve (16) is movably connected to the top of the furnace body (1). One end of the push rod (19) is connected to the sleeve (16), and the other end of the push rod (19) is connected to the furnace body (1).

7. The heat exchange structure for a hot blast stove as described in claim 6, characterized in that, It also includes a temperature sensor (20) and a smoke sensor (21), which are installed on the furnace body (1). The probes of the temperature sensor (20) and the smoke sensor (21) extend into the top of the heating chamber of the furnace body (1). The temperature sensor (20) and the smoke sensor (21) are both located above the filter layer (17).

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